泄漏同轴电缆在半闭域及闭域空间无线通信中的应用技术研究
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摘要
泄漏同轴电缆(简称漏缆,也称连续天线)是实现半闭域及闭域空间双工无隙移动通信的重要信息载体,它兼备远距离无线及有线通信的功能,以此弥补了单纯采用传统天线通信方式所存在的不可避免的通信盲区问题,可广泛应用于诸如地铁、隧道、矿井、高速公路及高速铁路沿线等半闭域或闭域空间的移动通信。本文围绕漏缆在各种复杂电磁环境中的辐射特性展开系统的理论分析,重点研究漏缆的传播特性在各种适用通信系统中的数学模型、分析计算方法与技术解决方案,为漏缆的工程应用提出具有一定参考价值的理论和技术支持。
针对诸如室内等半闭域空间的移动通信盲区问题,本文设计了一种新型耦合型漏缆,并且采用FDTD方法分析了该漏缆在开槽口处的电磁场分布状态,利用射线追踪法推导了室内空间无线电波的反射、折射及绕射系数,实现了半闭域空间中电磁波传播的跟踪与预测,验证了该设计的合理性与可行性,同时给出了具有典型代表意义的半闭域空间漏缆传播特性的分析方法和实现技术。
为了提高和不断完善闭域空间漏缆辐射特性的基础理论与计算分析方法,本文以地铁和矿井为例,在系统地分析了处于复杂恶劣环境中的漏缆传播路径及其特点的基础上建立了实用精确的数学模型。采用FDTD与射线追踪相结合的方法详细地研究和分析了典型闭域空间中漏缆的辐射特性,提出了具体的理论分析与计算方法及技术解决方案。针对地铁中同时存在的站台与隧道,设计了一种具有异地不同辐射方向的漏缆;针对矿井中宽区域场强覆盖需求,设计了一种全向辐射漏缆。
针对未来智能高速公路建设问题,本文提出了一种包含漏缆在内的无线通信系统构成设想,结合公路上机动车自身的通信功能,实现了通信系统各组成部分相互之间的数据传输,确保了智能高速公路沿线的电磁波无盲区覆盖,并采用FDTD方法与射线追踪法分别研究和分析了漏缆在智能高速公路通信系统中各部分的功能及辐射特性等问题。
Leaky coaxial cable (LCX) is also called continuous antenna, and it is the important information carrier to realize the duplex gapless mobile communication in confined zones, which both has the functions of wire and wireless communication in a long distance, so it can make up the disadvantage of the blind zone that is unavoidable in the traditional antenna communication, consequently LCX can be widely used in the mobile communication of many kinds of confined areas such as subway, tunnels, coals and highway, etc.. The radiation characteristics of LCX in every complex electromagnetic environment is analyzed and discussed theoretically in this dissertation, and the transmission characteristics of electromagnetic wave in confined zones are studied by building the exact simulation models, analyzing method and solution scheme. The simulation results of the dissertation provide some worthy theoretical and technological support for the engineering application.
Aiming at the blind zone of mobile communication in indoor space, a kind of coupling leaky coaxial cable is presented and desgined, and the field distribution of it is analyzed by using FDTD method, then propagation path of electromagnetic wave in indoor space is traced and forecasted by using ray-tracing method, and the coefficients of reflection, refraction and diffraction are deduced, the feasibility of the designed leaky coaxial cable is verified, and the representative analyzing method and technology of LCX transmission characteristcs in semi-confined zones are obtained.
To enhance and consummate the basic theory and analyzing method of LCX in confined zones, take the subway and coal mobile communication system for example, the dissertation analyzes the transmission path and characteristics of LCX in complex electromagnetic environment by the numbers. The radiation characteristics of LCX in the representative confined zones are studied using the hybrid method of FDTD and ray-tracing, and the material analyzing method and solution scheme are presented. For the co-existence of platform and tunnels in subway, a kind of leaky coaxial cable with different radiation directions at different part is designed; for the required wide coverage in coal mine, a kind of omni-direction radiation leaky coaxial cable is designed.
Aiming at the highway building problems in the future, an intelligent highway mobile communication system involves leaky coaxial cable is presented, combining the communication function of vehicles on the road, the information transmission between every parts of the communication system is realized, which ensures the electromagnetic wave coverage along the roadside, and the radiation characteristics of leaky coaxial cable at every part of intelligent highway mobile communication system are investigated by using FDTD and ray-tracing method.
针对诸如室内等半闭域空间的移动通信盲区问题,本文设计了一种新型耦合型漏缆,并且采用FDTD方法分析了该漏缆在开槽口处的电磁场分布状态,利用射线追踪法推导了室内空间无线电波的反射、折射及绕射系数,实现了半闭域空间中电磁波传播的跟踪与预测,验证了该设计的合理性与可行性,同时给出了具有典型代表意义的半闭域空间漏缆传播特性的分析方法和实现技术。
为了提高和不断完善闭域空间漏缆辐射特性的基础理论与计算分析方法,本文以地铁和矿井为例,在系统地分析了处于复杂恶劣环境中的漏缆传播路径及其特点的基础上建立了实用精确的数学模型。采用FDTD与射线追踪相结合的方法详细地研究和分析了典型闭域空间中漏缆的辐射特性,提出了具体的理论分析与计算方法及技术解决方案。针对地铁中同时存在的站台与隧道,设计了一种具有异地不同辐射方向的漏缆;针对矿井中宽区域场强覆盖需求,设计了一种全向辐射漏缆。
针对未来智能高速公路建设问题,本文提出了一种包含漏缆在内的无线通信系统构成设想,结合公路上机动车自身的通信功能,实现了通信系统各组成部分相互之间的数据传输,确保了智能高速公路沿线的电磁波无盲区覆盖,并采用FDTD方法与射线追踪法分别研究和分析了漏缆在智能高速公路通信系统中各部分的功能及辐射特性等问题。
Leaky coaxial cable (LCX) is also called continuous antenna, and it is the important information carrier to realize the duplex gapless mobile communication in confined zones, which both has the functions of wire and wireless communication in a long distance, so it can make up the disadvantage of the blind zone that is unavoidable in the traditional antenna communication, consequently LCX can be widely used in the mobile communication of many kinds of confined areas such as subway, tunnels, coals and highway, etc.. The radiation characteristics of LCX in every complex electromagnetic environment is analyzed and discussed theoretically in this dissertation, and the transmission characteristics of electromagnetic wave in confined zones are studied by building the exact simulation models, analyzing method and solution scheme. The simulation results of the dissertation provide some worthy theoretical and technological support for the engineering application.
Aiming at the blind zone of mobile communication in indoor space, a kind of coupling leaky coaxial cable is presented and desgined, and the field distribution of it is analyzed by using FDTD method, then propagation path of electromagnetic wave in indoor space is traced and forecasted by using ray-tracing method, and the coefficients of reflection, refraction and diffraction are deduced, the feasibility of the designed leaky coaxial cable is verified, and the representative analyzing method and technology of LCX transmission characteristcs in semi-confined zones are obtained.
To enhance and consummate the basic theory and analyzing method of LCX in confined zones, take the subway and coal mobile communication system for example, the dissertation analyzes the transmission path and characteristics of LCX in complex electromagnetic environment by the numbers. The radiation characteristics of LCX in the representative confined zones are studied using the hybrid method of FDTD and ray-tracing, and the material analyzing method and solution scheme are presented. For the co-existence of platform and tunnels in subway, a kind of leaky coaxial cable with different radiation directions at different part is designed; for the required wide coverage in coal mine, a kind of omni-direction radiation leaky coaxial cable is designed.
Aiming at the highway building problems in the future, an intelligent highway mobile communication system involves leaky coaxial cable is presented, combining the communication function of vehicles on the road, the information transmission between every parts of the communication system is realized, which ensures the electromagnetic wave coverage along the roadside, and the radiation characteristics of leaky coaxial cable at every part of intelligent highway mobile communication system are investigated by using FDTD and ray-tracing method.
引文
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